Discussion in 'US Coins Forum' started by Insider, Sep 28, 2023.
What caused it?
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I believe they're called copper spots and are caused by a not fully mixed alloy.
describing something we see on a coin to ourselves. It would eliminate a lot of guesses and train our minds to be critical. Let's use the guy who is older than dirt around here For example:
GDJMSP, posted: "The brown looks more like a foreign material [with uneven borders, different intensity, and odd shapes on top of the surface] that got on the coin to me. Grandpa implied my words in brackets because he is not a novice - the members my quizzes are for.
Now, anyone who guessed "spot" should look up definition #1 in the dictionary. Those ARE NOT SPOTS! What are they? Beats my five aces BUT this exact residue is often found on gold coins that come from the ocean or have been buried. Because of the reddish-brown color, I'm going to bet it is an iron residue.
Should come off with an EDTA solution.
@BadThad, guess what, you guessed too!
This smacks of jealousy. After all, this is a guessing game for everyone.
There is always one. This is nonsense.
At least @BadThad posted his opinion. Class clowns are one of the reasons I stopped posting quizzes.
The spots on this piece are odd, however. They don’t look like the usual copper spots I have seen. It looks like some foreign material was on the flan when the coin was struck.
This leads the reason why some modern gold coins, which are supposed to be .999 gold, have red spots. Could it be something the mint used to wash the planchets that was not fully rinsed?
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